National Pollutant Discharge Elimination System (NPDES) permits
Ecology administers NPDES permits under authority delegated to the department by the U.S. Environmental Protection Agency. These permits outline the conditions under which King County can discharge treated wastewater.
Brightwater Treatment Plant: WA0032247, expires February 28, 2023 (administratively extended)
South Treatment Plant: WA0029581, expires July 31, 2020 (administratively extended)
West Point Treatment Plant: WA0029181, expires January 1, 2020 (administratively extended)
Carnation Treatment Plant: WA0032182, expires October 31, 2026
Vashon Treatment Plant: WA0022527, expires Feb. 28, 2022 (administratively extended)
Puget Sound Nutrient General Permit
Puget Sound Nutrient General Permit: effective Jan. 1, 2022; expires Dec. 31, 2026
- Fact sheet
- Note: The Puget Sound Nutrient General Permit is applicable only to King County’s four wastewater treatment plants that discharge directly to Puget Sound (i.e., West Point, South, Brightwater, and Vashon). King County submitted its initial applications, and obtained coverage under this permit for the four plants in March 2022.
For more information, visit the Puget Sound Nutrient General Permit (Department of Ecology).
Reclaimed water permits
Learn more about reclaimed water.
Brightwater Treatment Plant: ST0045498, expires April 30, 2024
South Treatment Plant: ST7445, expires July 31, 2020
Carnation Treatment Plant: expires Dec 31, 2018
- Combined with NPDES permit above